Remove backends.

compiler/java/com/google/dart/compiler/backend/js/JsConstructExpressionVisitor.java

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-package com.google.dart.compiler.backend.js;
-
-import com.google.dart.compiler.backend.js.ast.JsArrayAccess;
-import com.google.dart.compiler.backend.js.ast.JsArrayLiteral;
-import com.google.dart.compiler.backend.js.ast.JsContext;
-import com.google.dart.compiler.backend.js.ast.JsExpression;
-import com.google.dart.compiler.backend.js.ast.JsFunction;
-import com.google.dart.compiler.backend.js.ast.JsInvocation;
-import com.google.dart.compiler.backend.js.ast.JsNameRef;
-import com.google.dart.compiler.backend.js.ast.JsNew;
-import com.google.dart.compiler.backend.js.ast.JsObjectLiteral;
-import com.google.dart.compiler.backend.js.ast.JsVisitable;
-import com.google.dart.compiler.backend.js.ast.JsVisitor;
-
-/**
- * Searches for method invocations in constructor expressions that would not
- * normally be surrounded by parentheses.
- */
-public class JsConstructExpressionVisitor extends JsVisitor {
-
-  public static boolean exec(JsExpression expression) {
-    if (JsPrecedenceVisitor.exec(expression) < JsPrecedenceVisitor.PRECEDENCE_NEW) {
-      return true;
-    }
-    JsConstructExpressionVisitor visitor = new JsConstructExpressionVisitor();
-    visitor.accept(expression);
-    return visitor.containsInvocation;
-  }
-
-  private boolean containsInvocation = false;
-
-  private JsConstructExpressionVisitor() {
-  }
-
-  /**
-   * We only look at the array expression since the index has its own scope.
-   */
-  @Override
-  public boolean visit(JsArrayAccess x, JsContext ctx) {
-    accept(x.getArrayExpr());
-    return false;
-  }
-
-  /**
-   * Array literals have their own scoping.
-   */
-  @Override
-  public boolean visit(JsArrayLiteral x, JsContext ctx) {
-    return false;
-  }
-
-  /**
-   * Functions have their own scoping.
-   */
-  @Override
-  public boolean visit(JsFunction x, JsContext ctx) {
-    return false;
-  }
-
-  @Override
-  public boolean visit(JsInvocation x, JsContext ctx) {
-    containsInvocation = true;
-    return false;
-  }
-
-  @Override
-  public boolean visit(JsNameRef x, JsContext ctx) {
-    if (!x.isLeaf()) {
-      accept(x.getQualifier());
-    }
-    return false;
-  }
-
-  /**
-   * New constructs bind to the nearest set of parentheses.
-   */
-  @Override
-  public boolean visit(JsNew x, JsContext ctx) {
-    return false;
-  }
-
-  /**
-   * Object literals have their own scope.
-   */
-  @Override
-  public boolean visit(JsObjectLiteral x, JsContext ctx) {
-    return false;
-  }
-
-  /**
-   * We only look at nodes that would not normally be surrounded by parentheses.
-   */
-  @Override
-  protected <T extends JsVisitable> T doAccept(T node) {
-    // Assign to Object to prevent 'inconvertible types' compile errors due
-    // to http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6548436
-    // reproducible in jdk1.6.0_02.
-    Object o = node;
-    if (o instanceof JsExpression) {
-      JsExpression expression = (JsExpression) o;
-      int precedence = JsPrecedenceVisitor.exec(expression);
-      // Only visit expressions that won't automatically be surrounded by
-      // parentheses
-      if (precedence < JsPrecedenceVisitor.PRECEDENCE_NEW) {
-        return node;
-      }
-    }
-    return super.doAccept(node);
-  }
-}